<meta-data>

A name-value pair for an item of additional, arbitrary data that can
be supplied to the parent component. A component element can contain any
number of <meta-data> subelements. The values from all of
them are collected in a single Bundle object and made
available to the component as the
PackageItemInfo.metaData field.

Ordinary values are specified through the value
attribute. However, to assign a resource ID as the value, use the
resource attribute instead. For example,
the following code assigns whatever value is stored in the @string/kangaroo
resource to the "zoo" name:

<meta-data android:name="zoo" android:value="@string/kangaroo" />

On the other hand, using the resource attribute would assign "zoo"
the numeric ID of the resource, not the value stored in the resource:

<meta-data android:name="zoo" android:resource="@string/kangaroo" />

It is highly recommended that you avoid supplying related data as
multiple separate <meta-data> entries. Instead, if you
have complex data to associate with a component, store it as a resource and
use the resource attribute to inform the component of its ID.

attributes:

android:name

A unique name for the item. To ensure that the name is unique, use a
Java-style naming convention — for example,
"com.example.project.activity.fred".

android:resource

A reference to a resource. The ID of the resource is the value assigned
to the item. The ID can be retrieved from the meta-data Bundle by the
Bundle.getInt() method.

android:value

The value assigned to the item. The data types that can be assigned as values and the Bundle methods that components use to retrieve those values are listed in the following table:

Type

Bundle method

String value, using double backslashes (\\) to escape characters
— such as "\\n" and "\\uxxxxx" for a Unicode character.